Standardize line breaks within headers.

Fix the unit test to match.

All line endings in the unit test are now the same.

(Just for consistency.  Not a big deal, since such problems are fixed when
the messages are run through EOLConvertingOutputStream.)

src/com/fsck/k9/mail/internet/MimeBodyPart.java

@@ -76,10 +76,10 @@ public class MimeBodyPart extends BodyPart {
                 setEncoding(MimeUtil.ENC_8BIT);
             }
         } else if (body instanceof TextBody) {
-            String contentType = String.format("%s;\n charset=utf-8", getMimeType());
+            String contentType = String.format("%s;\r\n charset=utf-8", getMimeType());
             String name = MimeUtility.getHeaderParameter(getContentType(), "name");
             if (name != null) {
-                contentType += String.format(";\n name=\"%s\"", name);
+                contentType += String.format(";\r\n name=\"%s\"", name);
             }
             setHeader(MimeHeader.HEADER_CONTENT_TYPE, contentType);
             setEncoding(MimeUtil.ENC_8BIT);

src/com/fsck/k9/mail/internet/MimeMessage.java

@@ -384,7 +384,7 @@ public class MimeMessage extends Message {
                 setEncoding(MimeUtil.ENC_8BIT);
             }
         } else if (body instanceof TextBody) {
-            setHeader(MimeHeader.HEADER_CONTENT_TYPE, String.format("%s;\n charset=utf-8",
+            setHeader(MimeHeader.HEADER_CONTENT_TYPE, String.format("%s;\r\n charset=utf-8",
                       getMimeType()));
             setEncoding(MimeUtil.ENC_8BIT);
         }

src/com/fsck/k9/mail/internet/MimeUtility.java

@@ -3367,7 +3367,7 @@ public class MimeUtility {
 
     public static void setCharset(String charset, Part part) throws MessagingException {
         part.setHeader(MimeHeader.HEADER_CONTENT_TYPE,
-                       part.getMimeType() + ";\n charset=" + getExternalCharset(charset));
+                       part.getMimeType() + ";\r\n charset=" + getExternalCharset(charset));
     }
 
     public static String getExternalCharset(String charset) {

tests/src/com/fsck/k9/mail/MessageTest.java

@@ -33,7 +33,7 @@ public class MessageTest extends AndroidTestCase {
             + "Content-Transfer-Encoding: 8bit\r\n"
             + "\r\n"
             + "------Boundary103\r\n"
-            + "Content-Type: text/plain;\n"
+            + "Content-Type: text/plain;\r\n"
             + " charset=utf-8\r\n"
             + "Content-Transfer-Encoding: 8bit\r\n"
             + "\r\n"
@@ -43,7 +43,7 @@ public class MessageTest extends AndroidTestCase {
             + "End of test.\r\n"
             + "\r\n"
             + "------Boundary103\r\n"
-            + "Content-Type: text/plain;\n"
+            + "Content-Type: text/plain;\r\n"
             + " charset=utf-8\r\n"
             + "Content-Transfer-Encoding: quoted-printable\r\n"
             + "\r\n"
@@ -72,7 +72,7 @@ public class MessageTest extends AndroidTestCase {
             + "Content-Transfer-Encoding: 8bit\r\n"
             + "\r\n"
             + "------Boundary102\r\n"
-            + "Content-Type: text/plain;\n"
+            + "Content-Type: text/plain;\r\n"
             + " charset=utf-8\r\n"
             + "Content-Transfer-Encoding: 8bit\r\n"
             + "\r\n"
@@ -82,7 +82,7 @@ public class MessageTest extends AndroidTestCase {
             + "End of test.\r\n"
             + "\r\n"
             + "------Boundary102\r\n"
-            + "Content-Type: text/plain;\n"
+            + "Content-Type: text/plain;\r\n"
             + " charset=utf-8\r\n"
             + "Content-Transfer-Encoding: quoted-printable\r\n"
             + "\r\n"
@@ -111,7 +111,7 @@ public class MessageTest extends AndroidTestCase {
             + "Content-Transfer-Encoding: 8bit\r\n"
             + "\r\n"
             + "------Boundary101\r\n"
-            + "Content-Type: text/plain;\n"
+            + "Content-Type: text/plain;\r\n"
             + " charset=utf-8\r\n"
             + "Content-Transfer-Encoding: 8bit\r\n"
             + "\r\n"
@@ -121,7 +121,7 @@ public class MessageTest extends AndroidTestCase {
             + "End of test.\r\n"
             + "\r\n"
             + "------Boundary101\r\n"
-            + "Content-Type: text/plain;\n"
+            + "Content-Type: text/plain;\r\n"
             + " charset=utf-8\r\n"
             + "Content-Transfer-Encoding: quoted-printable\r\n"
             + "\r\n"
@@ -152,7 +152,7 @@ public class MessageTest extends AndroidTestCase {
             + "Content-Transfer-Encoding: 7bit\r\n"
             + "\r\n"
             + "------Boundary103\r\n"
-            + "Content-Type: text/plain;\n"
+            + "Content-Type: text/plain;\r\n"
             + " charset=utf-8\r\n"
             + "Content-Transfer-Encoding: quoted-printable\r\n"
             + "\r\n"
@@ -162,7 +162,7 @@ public class MessageTest extends AndroidTestCase {
             + "End of test=2E\r\n"
             + "\r\n"
             + "------Boundary103\r\n"
-            + "Content-Type: text/plain;\n"
+            + "Content-Type: text/plain;\r\n"
             + " charset=utf-8\r\n"
             + "Content-Transfer-Encoding: quoted-printable\r\n"
             + "\r\n"